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<p>SQL functions for conditional random field.
<a href="#details">More...</a></p>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a>
Functions</h2></td></tr>
<tr class="memitem:a2e7104fea95ca76587e7fae9bcb0d7ed"><td class="memItemLeft" align="right" valign="top">float8[]&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="crf_8sql__in.html#a2e7104fea95ca76587e7fae9bcb0d7ed">lincrf_lbfgs_step_transition</a> (float8[], float8[], float8[], float8[], float8, float8, float8[])</td></tr>
<tr class="separator:a2e7104fea95ca76587e7fae9bcb0d7ed"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a45f3eaf0c80cdfa99872cd071020d5c7"><td class="memItemLeft" align="right" valign="top">float8[]&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="crf_8sql__in.html#a45f3eaf0c80cdfa99872cd071020d5c7">lincrf_lbfgs_step_merge_states</a> (float8[] state1, float8[] state2)</td></tr>
<tr class="separator:a45f3eaf0c80cdfa99872cd071020d5c7"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a5bf4b2738003096f4eeeccd0eb5e98f0"><td class="memItemLeft" align="right" valign="top">float8[]&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="crf_8sql__in.html#a5bf4b2738003096f4eeeccd0eb5e98f0">lincrf_lbfgs_step_final</a> (float8[] state)</td></tr>
<tr class="separator:a5bf4b2738003096f4eeeccd0eb5e98f0"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a47ef6b30d54ac4ef89cb664a681d1067"><td class="memItemLeft" align="right" valign="top">float8&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="crf_8sql__in.html#a47ef6b30d54ac4ef89cb664a681d1067">internal_lincrf_lbfgs_converge</a> (float8[] state)</td></tr>
<tr class="separator:a47ef6b30d54ac4ef89cb664a681d1067"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:aff63c9a56bebf501a2f40971271605c2"><td class="memItemLeft" align="right" valign="top">lincrf_result&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="crf_8sql__in.html#aff63c9a56bebf501a2f40971271605c2">internal_lincrf_lbfgs_result</a> (float8[] state)</td></tr>
<tr class="separator:aff63c9a56bebf501a2f40971271605c2"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a590cd748d8e18055d851e7d4f4a3ca00"><td class="memItemLeft" align="right" valign="top">aggregate float8[]&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="crf_8sql__in.html#a590cd748d8e18055d851e7d4f4a3ca00">lincrf_lbfgs_step</a> (float8[], float8[], float8[], float8, float8, float8[])</td></tr>
<tr class="separator:a590cd748d8e18055d851e7d4f4a3ca00"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a73693c959db4ca3dbfd1b9debcca2c8f"><td class="memItemLeft" align="right" valign="top">aggregate anyarray&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="crf_8sql__in.html#a73693c959db4ca3dbfd1b9debcca2c8f">array_union</a> (anyarray)</td></tr>
<tr class="separator:a73693c959db4ca3dbfd1b9debcca2c8f"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a6fc65937058ffc52a0f963f082f8b05e"><td class="memItemLeft" align="right" valign="top">integer&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="crf_8sql__in.html#a6fc65937058ffc52a0f963f082f8b05e">compute_lincrf</a> (varchar source, varchar sparse_R, varchar dense_M, varchar sparse_M, varchar featureSize, integer tagSize, integer maxNumIterations)</td></tr>
<tr class="separator:a6fc65937058ffc52a0f963f082f8b05e"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:afb77a0c0a2cfacdfff33fb826ff1c0cd"><td class="memItemLeft" align="right" valign="top">integer&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="crf_8sql__in.html#afb77a0c0a2cfacdfff33fb826ff1c0cd">lincrf</a> (varchar source, varchar sparse_R, varchar dense_M, varchar sparse_M, varchar featureSize, integer tagSize, varchar featureset, varchar crf_feature, integer maxNumIterations=20)</td></tr>
<tr class="memdesc:afb77a0c0a2cfacdfff33fb826ff1c0cd"><td class="mdescLeft">&#160;</td><td class="mdescRight">Compute linear-chain crf coefficients and diagnostic statistics. <a href="#afb77a0c0a2cfacdfff33fb826ff1c0cd">More...</a><br/></td></tr>
<tr class="separator:afb77a0c0a2cfacdfff33fb826ff1c0cd"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a836f0eefb7b6fbc37fa1c382b2a95127"><td class="memItemLeft" align="right" valign="top">integer&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="crf_8sql__in.html#a836f0eefb7b6fbc37fa1c382b2a95127">lincrf</a> (varchar source, varchar sparse_R, varchar dense_M, varchar sparse_M, varchar featureSize, integer tagSize, varchar featureset, varchar crf_feature)</td></tr>
<tr class="separator:a836f0eefb7b6fbc37fa1c382b2a95127"><td class="memSeparator" colspan="2">&#160;</td></tr>
</table>
<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><dl class="section date"><dt>Date</dt><dd>July 2012</dd></dl>
<dl class="section see"><dt>See Also</dt><dd>For a brief introduction to conditional random field, see the module description <a class="el" href="group__grp__crf.html">Conditional Random Field</a>. </dd></dl>
</div><h2 class="groupheader">Function Documentation</h2>
<a class="anchor" id="a73693c959db4ca3dbfd1b9debcca2c8f"></a>
<div class="memitem">
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<td class="memname">aggregate anyarray array_union </td>
<td>(</td>
<td class="paramtype">anyarray&#160;</td>
<td class="paramname">)</td><td></td>
<td></td>
</tr>
</table>
</div><div class="memdoc">
</div>
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<td class="memname">integer compute_lincrf </td>
<td>(</td>
<td class="paramtype">varchar&#160;</td>
<td class="paramname"><em>source</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">varchar&#160;</td>
<td class="paramname"><em>sparse_R</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">varchar&#160;</td>
<td class="paramname"><em>dense_M</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">varchar&#160;</td>
<td class="paramname"><em>sparse_M</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">varchar&#160;</td>
<td class="paramname"><em>featureSize</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">integer&#160;</td>
<td class="paramname"><em>tagSize</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">integer&#160;</td>
<td class="paramname"><em>maxNumIterations</em>&#160;</td>
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<tr>
<td></td>
<td>)</td>
<td></td><td></td>
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</table>
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</div>
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<td class="memname">float8 internal_lincrf_lbfgs_converge </td>
<td>(</td>
<td class="paramtype">float8[]&#160;</td>
<td class="paramname"><em>state</em>)</td><td></td>
<td></td>
</tr>
</table>
</div><div class="memdoc">
</div>
</div>
<a class="anchor" id="aff63c9a56bebf501a2f40971271605c2"></a>
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<td class="memname">lincrf_result internal_lincrf_lbfgs_result </td>
<td>(</td>
<td class="paramtype">float8[]&#160;</td>
<td class="paramname"><em>state</em>)</td><td></td>
<td></td>
</tr>
</table>
</div><div class="memdoc">
</div>
</div>
<a class="anchor" id="afb77a0c0a2cfacdfff33fb826ff1c0cd"></a>
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<td class="memname">integer lincrf </td>
<td>(</td>
<td class="paramtype">varchar&#160;</td>
<td class="paramname"><em>source</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">varchar&#160;</td>
<td class="paramname"><em>sparse_R</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">varchar&#160;</td>
<td class="paramname"><em>dense_M</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">varchar&#160;</td>
<td class="paramname"><em>sparse_M</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">varchar&#160;</td>
<td class="paramname"><em>featureSize</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">integer&#160;</td>
<td class="paramname"><em>tagSize</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">varchar&#160;</td>
<td class="paramname"><em>featureset</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">varchar&#160;</td>
<td class="paramname"><em>crf_feature</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">integer&#160;</td>
<td class="paramname"><em>maxNumIterations</em> = <code>20</code>&#160;</td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
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<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">source</td><td>Name of the source relation containing the training data </td></tr>
<tr><td class="paramname">sparse_R</td><td>Name of the sparse single state feature column (of type DOUBLE PRECISION[]) </td></tr>
<tr><td class="paramname">dense_M</td><td>Name of the dense two state feature column (of type DOUBLE PRECISION[]) </td></tr>
<tr><td class="paramname">sparse_M</td><td>Name of the sparse two state feature column (of type DOUBLE PRECISION[]) </td></tr>
<tr><td class="paramname">featureSize</td><td>Name of feature size column (of type DOUBLE PRECISION) </td></tr>
<tr><td class="paramname">tagSize</td><td>The number of tags in the tag set </td></tr>
<tr><td class="paramname">featureset</td><td>The unique feature set </td></tr>
<tr><td class="paramname">crf_feature</td><td>The Name of output feature table </td></tr>
<tr><td class="paramname">maxNumIterations</td><td>The maximum number of iterations</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>a composite value:<ul>
<li><code>coef FLOAT8[]</code> - Array of coefficients, \( \boldsymbol c \)</li>
<li><code>log_likelihood FLOAT8</code> - Log-likelihood \( l(\boldsymbol c) \)</li>
<li><code>num_iterations INTEGER</code> - The number of iterations before the algorithm terminated <br/>
<br/>
A 'crf_feature' table is used to store all the features and corresponding weights</li>
</ul>
</dd></dl>
<dl class="section note"><dt>Note</dt><dd>This function starts an iterative algorithm. It is not an aggregate function. Source and column names have to be passed as strings (due to limitations of the SQL syntax). </dd></dl>
</div>
</div>
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<td class="memname">integer lincrf </td>
<td>(</td>
<td class="paramtype">varchar&#160;</td>
<td class="paramname"><em>source</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">varchar&#160;</td>
<td class="paramname"><em>sparse_R</em>, </td>
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<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">varchar&#160;</td>
<td class="paramname"><em>dense_M</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">varchar&#160;</td>
<td class="paramname"><em>sparse_M</em>, </td>
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<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">varchar&#160;</td>
<td class="paramname"><em>featureSize</em>, </td>
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<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">integer&#160;</td>
<td class="paramname"><em>tagSize</em>, </td>
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<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">varchar&#160;</td>
<td class="paramname"><em>featureset</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">varchar&#160;</td>
<td class="paramname"><em>crf_feature</em>&#160;</td>
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<tr>
<td></td>
<td>)</td>
<td></td><td></td>
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<td class="memname">aggregate float8 [] lincrf_lbfgs_step </td>
<td>(</td>
<td class="paramtype">float8&#160;</td>
<td class="paramname">[], </td>
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<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">float8&#160;</td>
<td class="paramname">[], </td>
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<td class="paramkey"></td>
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<td class="paramtype">float8&#160;</td>
<td class="paramname">[], </td>
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<td class="paramtype">float8&#160;</td>
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<td class="paramtype">float8&#160;</td>
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<td class="paramtype">float8&#160;</td>
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<td class="memname">float8 [] lincrf_lbfgs_step_final </td>
<td>(</td>
<td class="paramtype">float8[]&#160;</td>
<td class="paramname"><em>state</em>)</td><td></td>
<td></td>
</tr>
</table>
</div><div class="memdoc">
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<td class="memname">float8 [] lincrf_lbfgs_step_merge_states </td>
<td>(</td>
<td class="paramtype">float8[]&#160;</td>
<td class="paramname"><em>state1</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
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